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#33849 04/25/02 10:01 AM
Joined: Apr 2002
Posts: 106
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Joined: Apr 2002
Posts: 106
I have a pond about 3 acres in size with an ave. depth of 6 ft. Chara has taken over about 30-40% of my pond. About half remains submerged all year while the other reaches the top. What is a good technique to kill both. What chemicals are cost effective and in what form (liquid or granular)?

#33850 05/03/02 09:56 PM
Joined: Apr 2002
Posts: 1,488
Likes: 2
Joined: Apr 2002
Posts: 1,488
Likes: 2
Chara is probably my LEAST "favorite" aquatic pest to challenge. Its presence indicates that you have very hard water (so I'd rule out the use of copper sulfate - period). A chelated copper (eg CUTRINE PLUS GRANULES) may be useful in knocking the chara-population back for a short period. However, if you continue to have ultra-clear water (my bet is that your water is crystal clear - ???), the chara will very likely return in fairly quick fashion. So, I'd also suggest implementing a plankton-inducing fertilization program (to reduce sunlight penetration) following the chelated-copper treatment. The sooner your water clarity is reduced, the less problem chara will present in the deeper areas of your pond.

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